A Free Syrian Army fighter holds his weapon as he prepares himself for advance, close to a military base, near Azaz, Syria, Monday, Dec. 10, 2012. The gains by rebel forces came as the European Union denounced the Syrian conflict, which activists said had killed more than 40,000 people. (AP Photo/Manu Brabo)

Why Are Europeans Waging Jihad In Syria?

Some 600 youths from Europe have joined Muslim extremists fighting to topple Syria’s government. Officials fear what happens when they return.